drivers/gpu/drm/amd/amdkfd/kfd

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This source file includes following definitions.
page_slots
allocate_signal_page
allocate_event_notification_slot
lookup_event_by_id
lookup_signaled_event_by_partial_id
create_signal_event
create_other_event
kfd_event_init_process
destroy_event
destroy_events
shutdown_signal_page
kfd_event_free_process
event_can_be_gpu_signaled
event_can_be_cpu_signaled
kfd_event_page_set
kfd_event_create
kfd_event_destroy
set_event
kfd_set_event
reset_event
kfd_reset_event
acknowledge_signal
set_event_from_interrupt
kfd_signal_event_interrupt
alloc_event_waiters
init_event_waiter_get_status
init_event_waiter_add_to_waitlist
test_event_condition
copy_signaled_event_data
user_timeout_to_jiffies
free_waiters
kfd_wait_on_events
kfd_event_mmap
lookup_events_by_type_and_signal
kfd_signal_iommu_event
kfd_signal_hw_exception_event
kfd_signal_vm_fault_event
kfd_signal_reset_event
   1 /*
   2  * Copyright 2014 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22 
  23 #include <linux/mm_types.h>
  24 #include <linux/slab.h>
  25 #include <linux/types.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/sched/mm.h>
  28 #include <linux/uaccess.h>
  29 #include <linux/mman.h>
  30 #include <linux/memory.h>
  31 #include "kfd_priv.h"
  32 #include "kfd_events.h"
  33 #include "kfd_iommu.h"
  34 #include <linux/device.h>
  35 
  36 /*
  37  * Wrapper around wait_queue_entry_t
  38  */
  39 struct kfd_event_waiter {
  40         wait_queue_entry_t wait;
  41         struct kfd_event *event; /* Event to wait for */
  42         bool activated;          /* Becomes true when event is signaled */
  43 };
  44 
  45 /*
  46  * Each signal event needs a 64-bit signal slot where the signaler will write
  47  * a 1 before sending an interrupt. (This is needed because some interrupts
  48  * do not contain enough spare data bits to identify an event.)
  49  * We get whole pages and map them to the process VA.
  50  * Individual signal events use their event_id as slot index.
  51  */
  52 struct kfd_signal_page {
  53         uint64_t *kernel_address;
  54         uint64_t __user *user_address;
  55         bool need_to_free_pages;
  56 };
  57 
  58 
  59 static uint64_t *page_slots(struct kfd_signal_page *page)
  60 {
  61         return page->kernel_address;
  62 }
  63 
  64 static struct kfd_signal_page *allocate_signal_page(struct kfd_process *p)
  65 {
  66         void *backing_store;
  67         struct kfd_signal_page *page;
  68 
  69         page = kzalloc(sizeof(*page), GFP_KERNEL);
  70         if (!page)
  71                 return NULL;
  72 
  73         backing_store = (void *) __get_free_pages(GFP_KERNEL,
  74                                         get_order(KFD_SIGNAL_EVENT_LIMIT * 8));
  75         if (!backing_store)
  76                 goto fail_alloc_signal_store;
  77 
  78         /* Initialize all events to unsignaled */
  79         memset(backing_store, (uint8_t) UNSIGNALED_EVENT_SLOT,
  80                KFD_SIGNAL_EVENT_LIMIT * 8);
  81 
  82         page->kernel_address = backing_store;
  83         page->need_to_free_pages = true;
  84         pr_debug("Allocated new event signal page at %p, for process %p\n",
  85                         page, p);
  86 
  87         return page;
  88 
  89 fail_alloc_signal_store:
  90         kfree(page);
  91         return NULL;
  92 }
  93 
  94 static int allocate_event_notification_slot(struct kfd_process *p,
  95                                             struct kfd_event *ev)
  96 {
  97         int id;
  98 
  99         if (!p->signal_page) {
 100                 p->signal_page = allocate_signal_page(p);
 101                 if (!p->signal_page)
 102                         return -ENOMEM;
 103                 /* Oldest user mode expects 256 event slots */
 104                 p->signal_mapped_size = 256*8;
 105         }
 106 
 107         /*
 108          * Compatibility with old user mode: Only use signal slots
 109          * user mode has mapped, may be less than
 110          * KFD_SIGNAL_EVENT_LIMIT. This also allows future increase
 111          * of the event limit without breaking user mode.
 112          */
 113         id = idr_alloc(&p->event_idr, ev, 0, p->signal_mapped_size / 8,
 114                        GFP_KERNEL);
 115         if (id < 0)
 116                 return id;
 117 
 118         ev->event_id = id;
 119         page_slots(p->signal_page)[id] = UNSIGNALED_EVENT_SLOT;
 120 
 121         return 0;
 122 }
 123 
 124 /*
 125  * Assumes that p->event_mutex is held and of course that p is not going
 126  * away (current or locked).
 127  */
 128 static struct kfd_event *lookup_event_by_id(struct kfd_process *p, uint32_t id)
 129 {
 130         return idr_find(&p->event_idr, id);
 131 }
 132 
 133 /**
 134  * lookup_signaled_event_by_partial_id - Lookup signaled event from partial ID
 135  * @p:     Pointer to struct kfd_process
 136  * @id:    ID to look up
 137  * @bits:  Number of valid bits in @id
 138  *
 139  * Finds the first signaled event with a matching partial ID. If no
 140  * matching signaled event is found, returns NULL. In that case the
 141  * caller should assume that the partial ID is invalid and do an
 142  * exhaustive search of all siglaned events.
 143  *
 144  * If multiple events with the same partial ID signal at the same
 145  * time, they will be found one interrupt at a time, not necessarily
 146  * in the same order the interrupts occurred. As long as the number of
 147  * interrupts is correct, all signaled events will be seen by the
 148  * driver.
 149  */
 150 static struct kfd_event *lookup_signaled_event_by_partial_id(
 151         struct kfd_process *p, uint32_t id, uint32_t bits)
 152 {
 153         struct kfd_event *ev;
 154 
 155         if (!p->signal_page || id >= KFD_SIGNAL_EVENT_LIMIT)
 156                 return NULL;
 157 
 158         /* Fast path for the common case that @id is not a partial ID
 159          * and we only need a single lookup.
 160          */
 161         if (bits > 31 || (1U << bits) >= KFD_SIGNAL_EVENT_LIMIT) {
 162                 if (page_slots(p->signal_page)[id] == UNSIGNALED_EVENT_SLOT)
 163                         return NULL;
 164 
 165                 return idr_find(&p->event_idr, id);
 166         }
 167 
 168         /* General case for partial IDs: Iterate over all matching IDs
 169          * and find the first one that has signaled.
 170          */
 171         for (ev = NULL; id < KFD_SIGNAL_EVENT_LIMIT && !ev; id += 1U << bits) {
 172                 if (page_slots(p->signal_page)[id] == UNSIGNALED_EVENT_SLOT)
 173                         continue;
 174 
 175                 ev = idr_find(&p->event_idr, id);
 176         }
 177 
 178         return ev;
 179 }
 180 
 181 static int create_signal_event(struct file *devkfd,
 182                                 struct kfd_process *p,
 183                                 struct kfd_event *ev)
 184 {
 185         int ret;
 186 
 187         if (p->signal_mapped_size &&
 188             p->signal_event_count == p->signal_mapped_size / 8) {
 189                 if (!p->signal_event_limit_reached) {
 190                         pr_warn("Signal event wasn't created because limit was reached\n");
 191                         p->signal_event_limit_reached = true;
 192                 }
 193                 return -ENOSPC;
 194         }
 195 
 196         ret = allocate_event_notification_slot(p, ev);
 197         if (ret) {
 198                 pr_warn("Signal event wasn't created because out of kernel memory\n");
 199                 return ret;
 200         }
 201 
 202         p->signal_event_count++;
 203 
 204         ev->user_signal_address = &p->signal_page->user_address[ev->event_id];
 205         pr_debug("Signal event number %zu created with id %d, address %p\n",
 206                         p->signal_event_count, ev->event_id,
 207                         ev->user_signal_address);
 208 
 209         return 0;
 210 }
 211 
 212 static int create_other_event(struct kfd_process *p, struct kfd_event *ev)
 213 {
 214         /* Cast KFD_LAST_NONSIGNAL_EVENT to uint32_t. This allows an
 215          * intentional integer overflow to -1 without a compiler
 216          * warning. idr_alloc treats a negative value as "maximum
 217          * signed integer".
 218          */
 219         int id = idr_alloc(&p->event_idr, ev, KFD_FIRST_NONSIGNAL_EVENT_ID,
 220                            (uint32_t)KFD_LAST_NONSIGNAL_EVENT_ID + 1,
 221                            GFP_KERNEL);
 222 
 223         if (id < 0)
 224                 return id;
 225         ev->event_id = id;
 226 
 227         return 0;
 228 }
 229 
 230 void kfd_event_init_process(struct kfd_process *p)
 231 {
 232         mutex_init(&p->event_mutex);
 233         idr_init(&p->event_idr);
 234         p->signal_page = NULL;
 235         p->signal_event_count = 0;
 236 }
 237 
 238 static void destroy_event(struct kfd_process *p, struct kfd_event *ev)
 239 {
 240         struct kfd_event_waiter *waiter;
 241 
 242         /* Wake up pending waiters. They will return failure */
 243         list_for_each_entry(waiter, &ev->wq.head, wait.entry)
 244                 waiter->event = NULL;
 245         wake_up_all(&ev->wq);
 246 
 247         if (ev->type == KFD_EVENT_TYPE_SIGNAL ||
 248             ev->type == KFD_EVENT_TYPE_DEBUG)
 249                 p->signal_event_count--;
 250 
 251         idr_remove(&p->event_idr, ev->event_id);
 252         kfree(ev);
 253 }
 254 
 255 static void destroy_events(struct kfd_process *p)
 256 {
 257         struct kfd_event *ev;
 258         uint32_t id;
 259 
 260         idr_for_each_entry(&p->event_idr, ev, id)
 261                 destroy_event(p, ev);
 262         idr_destroy(&p->event_idr);
 263 }
 264 
 265 /*
 266  * We assume that the process is being destroyed and there is no need to
 267  * unmap the pages or keep bookkeeping data in order.
 268  */
 269 static void shutdown_signal_page(struct kfd_process *p)
 270 {
 271         struct kfd_signal_page *page = p->signal_page;
 272 
 273         if (page) {
 274                 if (page->need_to_free_pages)
 275                         free_pages((unsigned long)page->kernel_address,
 276                                    get_order(KFD_SIGNAL_EVENT_LIMIT * 8));
 277                 kfree(page);
 278         }
 279 }
 280 
 281 void kfd_event_free_process(struct kfd_process *p)
 282 {
 283         destroy_events(p);
 284         shutdown_signal_page(p);
 285 }
 286 
 287 static bool event_can_be_gpu_signaled(const struct kfd_event *ev)
 288 {
 289         return ev->type == KFD_EVENT_TYPE_SIGNAL ||
 290                                         ev->type == KFD_EVENT_TYPE_DEBUG;
 291 }
 292 
 293 static bool event_can_be_cpu_signaled(const struct kfd_event *ev)
 294 {
 295         return ev->type == KFD_EVENT_TYPE_SIGNAL;
 296 }
 297 
 298 int kfd_event_page_set(struct kfd_process *p, void *kernel_address,
 299                        uint64_t size)
 300 {
 301         struct kfd_signal_page *page;
 302 
 303         if (p->signal_page)
 304                 return -EBUSY;
 305 
 306         page = kzalloc(sizeof(*page), GFP_KERNEL);
 307         if (!page)
 308                 return -ENOMEM;
 309 
 310         /* Initialize all events to unsignaled */
 311         memset(kernel_address, (uint8_t) UNSIGNALED_EVENT_SLOT,
 312                KFD_SIGNAL_EVENT_LIMIT * 8);
 313 
 314         page->kernel_address = kernel_address;
 315 
 316         p->signal_page = page;
 317         p->signal_mapped_size = size;
 318 
 319         return 0;
 320 }
 321 
 322 int kfd_event_create(struct file *devkfd, struct kfd_process *p,
 323                      uint32_t event_type, bool auto_reset, uint32_t node_id,
 324                      uint32_t *event_id, uint32_t *event_trigger_data,
 325                      uint64_t *event_page_offset, uint32_t *event_slot_index)
 326 {
 327         int ret = 0;
 328         struct kfd_event *ev = kzalloc(sizeof(*ev), GFP_KERNEL);
 329 
 330         if (!ev)
 331                 return -ENOMEM;
 332 
 333         ev->type = event_type;
 334         ev->auto_reset = auto_reset;
 335         ev->signaled = false;
 336 
 337         init_waitqueue_head(&ev->wq);
 338 
 339         *event_page_offset = 0;
 340 
 341         mutex_lock(&p->event_mutex);
 342 
 343         switch (event_type) {
 344         case KFD_EVENT_TYPE_SIGNAL:
 345         case KFD_EVENT_TYPE_DEBUG:
 346                 ret = create_signal_event(devkfd, p, ev);
 347                 if (!ret) {
 348                         *event_page_offset = KFD_MMAP_TYPE_EVENTS;
 349                         *event_page_offset <<= PAGE_SHIFT;
 350                         *event_slot_index = ev->event_id;
 351                 }
 352                 break;
 353         default:
 354                 ret = create_other_event(p, ev);
 355                 break;
 356         }
 357 
 358         if (!ret) {
 359                 *event_id = ev->event_id;
 360                 *event_trigger_data = ev->event_id;
 361         } else {
 362                 kfree(ev);
 363         }
 364 
 365         mutex_unlock(&p->event_mutex);
 366 
 367         return ret;
 368 }
 369 
 370 /* Assumes that p is current. */
 371 int kfd_event_destroy(struct kfd_process *p, uint32_t event_id)
 372 {
 373         struct kfd_event *ev;
 374         int ret = 0;
 375 
 376         mutex_lock(&p->event_mutex);
 377 
 378         ev = lookup_event_by_id(p, event_id);
 379 
 380         if (ev)
 381                 destroy_event(p, ev);
 382         else
 383                 ret = -EINVAL;
 384 
 385         mutex_unlock(&p->event_mutex);
 386         return ret;
 387 }
 388 
 389 static void set_event(struct kfd_event *ev)
 390 {
 391         struct kfd_event_waiter *waiter;
 392 
 393         /* Auto reset if the list is non-empty and we're waking
 394          * someone. waitqueue_active is safe here because we're
 395          * protected by the p->event_mutex, which is also held when
 396          * updating the wait queues in kfd_wait_on_events.
 397          */
 398         ev->signaled = !ev->auto_reset || !waitqueue_active(&ev->wq);
 399 
 400         list_for_each_entry(waiter, &ev->wq.head, wait.entry)
 401                 waiter->activated = true;
 402 
 403         wake_up_all(&ev->wq);
 404 }
 405 
 406 /* Assumes that p is current. */
 407 int kfd_set_event(struct kfd_process *p, uint32_t event_id)
 408 {
 409         int ret = 0;
 410         struct kfd_event *ev;
 411 
 412         mutex_lock(&p->event_mutex);
 413 
 414         ev = lookup_event_by_id(p, event_id);
 415 
 416         if (ev && event_can_be_cpu_signaled(ev))
 417                 set_event(ev);
 418         else
 419                 ret = -EINVAL;
 420 
 421         mutex_unlock(&p->event_mutex);
 422         return ret;
 423 }
 424 
 425 static void reset_event(struct kfd_event *ev)
 426 {
 427         ev->signaled = false;
 428 }
 429 
 430 /* Assumes that p is current. */
 431 int kfd_reset_event(struct kfd_process *p, uint32_t event_id)
 432 {
 433         int ret = 0;
 434         struct kfd_event *ev;
 435 
 436         mutex_lock(&p->event_mutex);
 437 
 438         ev = lookup_event_by_id(p, event_id);
 439 
 440         if (ev && event_can_be_cpu_signaled(ev))
 441                 reset_event(ev);
 442         else
 443                 ret = -EINVAL;
 444 
 445         mutex_unlock(&p->event_mutex);
 446         return ret;
 447 
 448 }
 449 
 450 static void acknowledge_signal(struct kfd_process *p, struct kfd_event *ev)
 451 {
 452         page_slots(p->signal_page)[ev->event_id] = UNSIGNALED_EVENT_SLOT;
 453 }
 454 
 455 static void set_event_from_interrupt(struct kfd_process *p,
 456                                         struct kfd_event *ev)
 457 {
 458         if (ev && event_can_be_gpu_signaled(ev)) {
 459                 acknowledge_signal(p, ev);
 460                 set_event(ev);
 461         }
 462 }
 463 
 464 void kfd_signal_event_interrupt(unsigned int pasid, uint32_t partial_id,
 465                                 uint32_t valid_id_bits)
 466 {
 467         struct kfd_event *ev = NULL;
 468 
 469         /*
 470          * Because we are called from arbitrary context (workqueue) as opposed
 471          * to process context, kfd_process could attempt to exit while we are
 472          * running so the lookup function increments the process ref count.
 473          */
 474         struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
 475 
 476         if (!p)
 477                 return; /* Presumably process exited. */
 478 
 479         mutex_lock(&p->event_mutex);
 480 
 481         if (valid_id_bits)
 482                 ev = lookup_signaled_event_by_partial_id(p, partial_id,
 483                                                          valid_id_bits);
 484         if (ev) {
 485                 set_event_from_interrupt(p, ev);
 486         } else if (p->signal_page) {
 487                 /*
 488                  * Partial ID lookup failed. Assume that the event ID
 489                  * in the interrupt payload was invalid and do an
 490                  * exhaustive search of signaled events.
 491                  */
 492                 uint64_t *slots = page_slots(p->signal_page);
 493                 uint32_t id;
 494 
 495                 if (valid_id_bits)
 496                         pr_debug_ratelimited("Partial ID invalid: %u (%u valid bits)\n",
 497                                              partial_id, valid_id_bits);
 498 
 499                 if (p->signal_event_count < KFD_SIGNAL_EVENT_LIMIT / 64) {
 500                         /* With relatively few events, it's faster to
 501                          * iterate over the event IDR
 502                          */
 503                         idr_for_each_entry(&p->event_idr, ev, id) {
 504                                 if (id >= KFD_SIGNAL_EVENT_LIMIT)
 505                                         break;
 506 
 507                                 if (slots[id] != UNSIGNALED_EVENT_SLOT)
 508                                         set_event_from_interrupt(p, ev);
 509                         }
 510                 } else {
 511                         /* With relatively many events, it's faster to
 512                          * iterate over the signal slots and lookup
 513                          * only signaled events from the IDR.
 514                          */
 515                         for (id = 0; id < KFD_SIGNAL_EVENT_LIMIT; id++)
 516                                 if (slots[id] != UNSIGNALED_EVENT_SLOT) {
 517                                         ev = lookup_event_by_id(p, id);
 518                                         set_event_from_interrupt(p, ev);
 519                                 }
 520                 }
 521         }
 522 
 523         mutex_unlock(&p->event_mutex);
 524         kfd_unref_process(p);
 525 }
 526 
 527 static struct kfd_event_waiter *alloc_event_waiters(uint32_t num_events)
 528 {
 529         struct kfd_event_waiter *event_waiters;
 530         uint32_t i;
 531 
 532         event_waiters = kmalloc_array(num_events,
 533                                         sizeof(struct kfd_event_waiter),
 534                                         GFP_KERNEL);
 535 
 536         for (i = 0; (event_waiters) && (i < num_events) ; i++) {
 537                 init_wait(&event_waiters[i].wait);
 538                 event_waiters[i].activated = false;
 539         }
 540 
 541         return event_waiters;
 542 }
 543 
 544 static int init_event_waiter_get_status(struct kfd_process *p,
 545                 struct kfd_event_waiter *waiter,
 546                 uint32_t event_id)
 547 {
 548         struct kfd_event *ev = lookup_event_by_id(p, event_id);
 549 
 550         if (!ev)
 551                 return -EINVAL;
 552 
 553         waiter->event = ev;
 554         waiter->activated = ev->signaled;
 555         ev->signaled = ev->signaled && !ev->auto_reset;
 556 
 557         return 0;
 558 }
 559 
 560 static void init_event_waiter_add_to_waitlist(struct kfd_event_waiter *waiter)
 561 {
 562         struct kfd_event *ev = waiter->event;
 563 
 564         /* Only add to the wait list if we actually need to
 565          * wait on this event.
 566          */
 567         if (!waiter->activated)
 568                 add_wait_queue(&ev->wq, &waiter->wait);
 569 }
 570 
 571 /* test_event_condition - Test condition of events being waited for
 572  * @all:           Return completion only if all events have signaled
 573  * @num_events:    Number of events to wait for
 574  * @event_waiters: Array of event waiters, one per event
 575  *
 576  * Returns KFD_IOC_WAIT_RESULT_COMPLETE if all (or one) event(s) have
 577  * signaled. Returns KFD_IOC_WAIT_RESULT_TIMEOUT if no (or not all)
 578  * events have signaled. Returns KFD_IOC_WAIT_RESULT_FAIL if any of
 579  * the events have been destroyed.
 580  */
 581 static uint32_t test_event_condition(bool all, uint32_t num_events,
 582                                 struct kfd_event_waiter *event_waiters)
 583 {
 584         uint32_t i;
 585         uint32_t activated_count = 0;
 586 
 587         for (i = 0; i < num_events; i++) {
 588                 if (!event_waiters[i].event)
 589                         return KFD_IOC_WAIT_RESULT_FAIL;
 590 
 591                 if (event_waiters[i].activated) {
 592                         if (!all)
 593                                 return KFD_IOC_WAIT_RESULT_COMPLETE;
 594 
 595                         activated_count++;
 596                 }
 597         }
 598 
 599         return activated_count == num_events ?
 600                 KFD_IOC_WAIT_RESULT_COMPLETE : KFD_IOC_WAIT_RESULT_TIMEOUT;
 601 }
 602 
 603 /*
 604  * Copy event specific data, if defined.
 605  * Currently only memory exception events have additional data to copy to user
 606  */
 607 static int copy_signaled_event_data(uint32_t num_events,
 608                 struct kfd_event_waiter *event_waiters,
 609                 struct kfd_event_data __user *data)
 610 {
 611         struct kfd_hsa_memory_exception_data *src;
 612         struct kfd_hsa_memory_exception_data __user *dst;
 613         struct kfd_event_waiter *waiter;
 614         struct kfd_event *event;
 615         uint32_t i;
 616 
 617         for (i = 0; i < num_events; i++) {
 618                 waiter = &event_waiters[i];
 619                 event = waiter->event;
 620                 if (waiter->activated && event->type == KFD_EVENT_TYPE_MEMORY) {
 621                         dst = &data[i].memory_exception_data;
 622                         src = &event->memory_exception_data;
 623                         if (copy_to_user(dst, src,
 624                                 sizeof(struct kfd_hsa_memory_exception_data)))
 625                                 return -EFAULT;
 626                 }
 627         }
 628 
 629         return 0;
 630 
 631 }
 632 
 633 
 634 
 635 static long user_timeout_to_jiffies(uint32_t user_timeout_ms)
 636 {
 637         if (user_timeout_ms == KFD_EVENT_TIMEOUT_IMMEDIATE)
 638                 return 0;
 639 
 640         if (user_timeout_ms == KFD_EVENT_TIMEOUT_INFINITE)
 641                 return MAX_SCHEDULE_TIMEOUT;
 642 
 643         /*
 644          * msecs_to_jiffies interprets all values above 2^31-1 as infinite,
 645          * but we consider them finite.
 646          * This hack is wrong, but nobody is likely to notice.
 647          */
 648         user_timeout_ms = min_t(uint32_t, user_timeout_ms, 0x7FFFFFFF);
 649 
 650         return msecs_to_jiffies(user_timeout_ms) + 1;
 651 }
 652 
 653 static void free_waiters(uint32_t num_events, struct kfd_event_waiter *waiters)
 654 {
 655         uint32_t i;
 656 
 657         for (i = 0; i < num_events; i++)
 658                 if (waiters[i].event)
 659                         remove_wait_queue(&waiters[i].event->wq,
 660                                           &waiters[i].wait);
 661 
 662         kfree(waiters);
 663 }
 664 
 665 int kfd_wait_on_events(struct kfd_process *p,
 666                        uint32_t num_events, void __user *data,
 667                        bool all, uint32_t user_timeout_ms,
 668                        uint32_t *wait_result)
 669 {
 670         struct kfd_event_data __user *events =
 671                         (struct kfd_event_data __user *) data;
 672         uint32_t i;
 673         int ret = 0;
 674 
 675         struct kfd_event_waiter *event_waiters = NULL;
 676         long timeout = user_timeout_to_jiffies(user_timeout_ms);
 677 
 678         event_waiters = alloc_event_waiters(num_events);
 679         if (!event_waiters) {
 680                 ret = -ENOMEM;
 681                 goto out;
 682         }
 683 
 684         mutex_lock(&p->event_mutex);
 685 
 686         for (i = 0; i < num_events; i++) {
 687                 struct kfd_event_data event_data;
 688 
 689                 if (copy_from_user(&event_data, &events[i],
 690                                 sizeof(struct kfd_event_data))) {
 691                         ret = -EFAULT;
 692                         goto out_unlock;
 693                 }
 694 
 695                 ret = init_event_waiter_get_status(p, &event_waiters[i],
 696                                 event_data.event_id);
 697                 if (ret)
 698                         goto out_unlock;
 699         }
 700 
 701         /* Check condition once. */
 702         *wait_result = test_event_condition(all, num_events, event_waiters);
 703         if (*wait_result == KFD_IOC_WAIT_RESULT_COMPLETE) {
 704                 ret = copy_signaled_event_data(num_events,
 705                                                event_waiters, events);
 706                 goto out_unlock;
 707         } else if (WARN_ON(*wait_result == KFD_IOC_WAIT_RESULT_FAIL)) {
 708                 /* This should not happen. Events shouldn't be
 709                  * destroyed while we're holding the event_mutex
 710                  */
 711                 goto out_unlock;
 712         }
 713 
 714         /* Add to wait lists if we need to wait. */
 715         for (i = 0; i < num_events; i++)
 716                 init_event_waiter_add_to_waitlist(&event_waiters[i]);
 717 
 718         mutex_unlock(&p->event_mutex);
 719 
 720         while (true) {
 721                 if (fatal_signal_pending(current)) {
 722                         ret = -EINTR;
 723                         break;
 724                 }
 725 
 726                 if (signal_pending(current)) {
 727                         /*
 728                          * This is wrong when a nonzero, non-infinite timeout
 729                          * is specified. We need to use
 730                          * ERESTARTSYS_RESTARTBLOCK, but struct restart_block
 731                          * contains a union with data for each user and it's
 732                          * in generic kernel code that I don't want to
 733                          * touch yet.
 734                          */
 735                         ret = -ERESTARTSYS;
 736                         break;
 737                 }
 738 
 739                 /* Set task state to interruptible sleep before
 740                  * checking wake-up conditions. A concurrent wake-up
 741                  * will put the task back into runnable state. In that
 742                  * case schedule_timeout will not put the task to
 743                  * sleep and we'll get a chance to re-check the
 744                  * updated conditions almost immediately. Otherwise,
 745                  * this race condition would lead to a soft hang or a
 746                  * very long sleep.
 747                  */
 748                 set_current_state(TASK_INTERRUPTIBLE);
 749 
 750                 *wait_result = test_event_condition(all, num_events,
 751                                                     event_waiters);
 752                 if (*wait_result != KFD_IOC_WAIT_RESULT_TIMEOUT)
 753                         break;
 754 
 755                 if (timeout <= 0)
 756                         break;
 757 
 758                 timeout = schedule_timeout(timeout);
 759         }
 760         __set_current_state(TASK_RUNNING);
 761 
 762         /* copy_signaled_event_data may sleep. So this has to happen
 763          * after the task state is set back to RUNNING.
 764          */
 765         if (!ret && *wait_result == KFD_IOC_WAIT_RESULT_COMPLETE)
 766                 ret = copy_signaled_event_data(num_events,
 767                                                event_waiters, events);
 768 
 769         mutex_lock(&p->event_mutex);
 770 out_unlock:
 771         free_waiters(num_events, event_waiters);
 772         mutex_unlock(&p->event_mutex);
 773 out:
 774         if (ret)
 775                 *wait_result = KFD_IOC_WAIT_RESULT_FAIL;
 776         else if (*wait_result == KFD_IOC_WAIT_RESULT_FAIL)
 777                 ret = -EIO;
 778 
 779         return ret;
 780 }
 781 
 782 int kfd_event_mmap(struct kfd_process *p, struct vm_area_struct *vma)
 783 {
 784         unsigned long pfn;
 785         struct kfd_signal_page *page;
 786         int ret;
 787 
 788         /* check required size doesn't exceed the allocated size */
 789         if (get_order(KFD_SIGNAL_EVENT_LIMIT * 8) <
 790                         get_order(vma->vm_end - vma->vm_start)) {
 791                 pr_err("Event page mmap requested illegal size\n");
 792                 return -EINVAL;
 793         }
 794 
 795         page = p->signal_page;
 796         if (!page) {
 797                 /* Probably KFD bug, but mmap is user-accessible. */
 798                 pr_debug("Signal page could not be found\n");
 799                 return -EINVAL;
 800         }
 801 
 802         pfn = __pa(page->kernel_address);
 803         pfn >>= PAGE_SHIFT;
 804 
 805         vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE
 806                        | VM_DONTDUMP | VM_PFNMAP;
 807 
 808         pr_debug("Mapping signal page\n");
 809         pr_debug("     start user address  == 0x%08lx\n", vma->vm_start);
 810         pr_debug("     end user address    == 0x%08lx\n", vma->vm_end);
 811         pr_debug("     pfn                 == 0x%016lX\n", pfn);
 812         pr_debug("     vm_flags            == 0x%08lX\n", vma->vm_flags);
 813         pr_debug("     size                == 0x%08lX\n",
 814                         vma->vm_end - vma->vm_start);
 815 
 816         page->user_address = (uint64_t __user *)vma->vm_start;
 817 
 818         /* mapping the page to user process */
 819         ret = remap_pfn_range(vma, vma->vm_start, pfn,
 820                         vma->vm_end - vma->vm_start, vma->vm_page_prot);
 821         if (!ret)
 822                 p->signal_mapped_size = vma->vm_end - vma->vm_start;
 823 
 824         return ret;
 825 }
 826 
 827 /*
 828  * Assumes that p->event_mutex is held and of course
 829  * that p is not going away (current or locked).
 830  */
 831 static void lookup_events_by_type_and_signal(struct kfd_process *p,
 832                 int type, void *event_data)
 833 {
 834         struct kfd_hsa_memory_exception_data *ev_data;
 835         struct kfd_event *ev;
 836         uint32_t id;
 837         bool send_signal = true;
 838 
 839         ev_data = (struct kfd_hsa_memory_exception_data *) event_data;
 840 
 841         id = KFD_FIRST_NONSIGNAL_EVENT_ID;
 842         idr_for_each_entry_continue(&p->event_idr, ev, id)
 843                 if (ev->type == type) {
 844                         send_signal = false;
 845                         dev_dbg(kfd_device,
 846                                         "Event found: id %X type %d",
 847                                         ev->event_id, ev->type);
 848                         set_event(ev);
 849                         if (ev->type == KFD_EVENT_TYPE_MEMORY && ev_data)
 850                                 ev->memory_exception_data = *ev_data;
 851                 }
 852 
 853         if (type == KFD_EVENT_TYPE_MEMORY) {
 854                 dev_warn(kfd_device,
 855                         "Sending SIGSEGV to HSA Process with PID %d ",
 856                                 p->lead_thread->pid);
 857                 send_sig(SIGSEGV, p->lead_thread, 0);
 858         }
 859 
 860         /* Send SIGTERM no event of type "type" has been found*/
 861         if (send_signal) {
 862                 if (send_sigterm) {
 863                         dev_warn(kfd_device,
 864                                 "Sending SIGTERM to HSA Process with PID %d ",
 865                                         p->lead_thread->pid);
 866                         send_sig(SIGTERM, p->lead_thread, 0);
 867                 } else {
 868                         dev_err(kfd_device,
 869                                 "HSA Process (PID %d) got unhandled exception",
 870                                 p->lead_thread->pid);
 871                 }
 872         }
 873 }
 874 
 875 #ifdef KFD_SUPPORT_IOMMU_V2
 876 void kfd_signal_iommu_event(struct kfd_dev *dev, unsigned int pasid,
 877                 unsigned long address, bool is_write_requested,
 878                 bool is_execute_requested)
 879 {
 880         struct kfd_hsa_memory_exception_data memory_exception_data;
 881         struct vm_area_struct *vma;
 882 
 883         /*
 884          * Because we are called from arbitrary context (workqueue) as opposed
 885          * to process context, kfd_process could attempt to exit while we are
 886          * running so the lookup function increments the process ref count.
 887          */
 888         struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
 889         struct mm_struct *mm;
 890 
 891         if (!p)
 892                 return; /* Presumably process exited. */
 893 
 894         /* Take a safe reference to the mm_struct, which may otherwise
 895          * disappear even while the kfd_process is still referenced.
 896          */
 897         mm = get_task_mm(p->lead_thread);
 898         if (!mm) {
 899                 kfd_unref_process(p);
 900                 return; /* Process is exiting */
 901         }
 902 
 903         memset(&memory_exception_data, 0, sizeof(memory_exception_data));
 904 
 905         down_read(&mm->mmap_sem);
 906         vma = find_vma(mm, address);
 907 
 908         memory_exception_data.gpu_id = dev->id;
 909         memory_exception_data.va = address;
 910         /* Set failure reason */
 911         memory_exception_data.failure.NotPresent = 1;
 912         memory_exception_data.failure.NoExecute = 0;
 913         memory_exception_data.failure.ReadOnly = 0;
 914         if (vma && address >= vma->vm_start) {
 915                 memory_exception_data.failure.NotPresent = 0;
 916 
 917                 if (is_write_requested && !(vma->vm_flags & VM_WRITE))
 918                         memory_exception_data.failure.ReadOnly = 1;
 919                 else
 920                         memory_exception_data.failure.ReadOnly = 0;
 921 
 922                 if (is_execute_requested && !(vma->vm_flags & VM_EXEC))
 923                         memory_exception_data.failure.NoExecute = 1;
 924                 else
 925                         memory_exception_data.failure.NoExecute = 0;
 926         }
 927 
 928         up_read(&mm->mmap_sem);
 929         mmput(mm);
 930 
 931         pr_debug("notpresent %d, noexecute %d, readonly %d\n",
 932                         memory_exception_data.failure.NotPresent,
 933                         memory_exception_data.failure.NoExecute,
 934                         memory_exception_data.failure.ReadOnly);
 935 
 936         /* Workaround on Raven to not kill the process when memory is freed
 937          * before IOMMU is able to finish processing all the excessive PPRs
 938          */
 939         if (dev->device_info->asic_family != CHIP_RAVEN) {
 940                 mutex_lock(&p->event_mutex);
 941 
 942                 /* Lookup events by type and signal them */
 943                 lookup_events_by_type_and_signal(p, KFD_EVENT_TYPE_MEMORY,
 944                                 &memory_exception_data);
 945 
 946                 mutex_unlock(&p->event_mutex);
 947         }
 948 
 949         kfd_unref_process(p);
 950 }
 951 #endif /* KFD_SUPPORT_IOMMU_V2 */
 952 
 953 void kfd_signal_hw_exception_event(unsigned int pasid)
 954 {
 955         /*
 956          * Because we are called from arbitrary context (workqueue) as opposed
 957          * to process context, kfd_process could attempt to exit while we are
 958          * running so the lookup function increments the process ref count.
 959          */
 960         struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
 961 
 962         if (!p)
 963                 return; /* Presumably process exited. */
 964 
 965         mutex_lock(&p->event_mutex);
 966 
 967         /* Lookup events by type and signal them */
 968         lookup_events_by_type_and_signal(p, KFD_EVENT_TYPE_HW_EXCEPTION, NULL);
 969 
 970         mutex_unlock(&p->event_mutex);
 971         kfd_unref_process(p);
 972 }
 973 
 974 void kfd_signal_vm_fault_event(struct kfd_dev *dev, unsigned int pasid,
 975                                 struct kfd_vm_fault_info *info)
 976 {
 977         struct kfd_event *ev;
 978         uint32_t id;
 979         struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
 980         struct kfd_hsa_memory_exception_data memory_exception_data;
 981 
 982         if (!p)
 983                 return; /* Presumably process exited. */
 984         memset(&memory_exception_data, 0, sizeof(memory_exception_data));
 985         memory_exception_data.gpu_id = dev->id;
 986         memory_exception_data.failure.imprecise = true;
 987         /* Set failure reason */
 988         if (info) {
 989                 memory_exception_data.va = (info->page_addr) << PAGE_SHIFT;
 990                 memory_exception_data.failure.NotPresent =
 991                         info->prot_valid ? 1 : 0;
 992                 memory_exception_data.failure.NoExecute =
 993                         info->prot_exec ? 1 : 0;
 994                 memory_exception_data.failure.ReadOnly =
 995                         info->prot_write ? 1 : 0;
 996                 memory_exception_data.failure.imprecise = 0;
 997         }
 998         mutex_lock(&p->event_mutex);
 999 
1000         id = KFD_FIRST_NONSIGNAL_EVENT_ID;
1001         idr_for_each_entry_continue(&p->event_idr, ev, id)
1002                 if (ev->type == KFD_EVENT_TYPE_MEMORY) {
1003                         ev->memory_exception_data = memory_exception_data;
1004                         set_event(ev);
1005                 }
1006 
1007         mutex_unlock(&p->event_mutex);
1008         kfd_unref_process(p);
1009 }
1010 
1011 void kfd_signal_reset_event(struct kfd_dev *dev)
1012 {
1013         struct kfd_hsa_hw_exception_data hw_exception_data;
1014         struct kfd_hsa_memory_exception_data memory_exception_data;
1015         struct kfd_process *p;
1016         struct kfd_event *ev;
1017         unsigned int temp;
1018         uint32_t id, idx;
1019         int reset_cause = atomic_read(&dev->sram_ecc_flag) ?
1020                         KFD_HW_EXCEPTION_ECC :
1021                         KFD_HW_EXCEPTION_GPU_HANG;
1022 
1023         /* Whole gpu reset caused by GPU hang and memory is lost */
1024         memset(&hw_exception_data, 0, sizeof(hw_exception_data));
1025         hw_exception_data.gpu_id = dev->id;
1026         hw_exception_data.memory_lost = 1;
1027         hw_exception_data.reset_cause = reset_cause;
1028 
1029         memset(&memory_exception_data, 0, sizeof(memory_exception_data));
1030         memory_exception_data.ErrorType = KFD_MEM_ERR_SRAM_ECC;
1031         memory_exception_data.gpu_id = dev->id;
1032         memory_exception_data.failure.imprecise = true;
1033 
1034         idx = srcu_read_lock(&kfd_processes_srcu);
1035         hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1036                 mutex_lock(&p->event_mutex);
1037                 id = KFD_FIRST_NONSIGNAL_EVENT_ID;
1038                 idr_for_each_entry_continue(&p->event_idr, ev, id) {
1039                         if (ev->type == KFD_EVENT_TYPE_HW_EXCEPTION) {
1040                                 ev->hw_exception_data = hw_exception_data;
1041                                 set_event(ev);
1042                         }
1043                         if (ev->type == KFD_EVENT_TYPE_MEMORY &&
1044                             reset_cause == KFD_HW_EXCEPTION_ECC) {
1045                                 ev->memory_exception_data = memory_exception_data;
1046                                 set_event(ev);
1047                         }
1048                 }
1049                 mutex_unlock(&p->event_mutex);
1050         }
1051         srcu_read_unlock(&kfd_processes_srcu, idx);
1052 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/gpu/drm/amd/amdkfd/kfd_events.c

DEFINITIONS
